U.K. investor advisory group Pension Investment Research Consultants Wednesday joined the growing opposition to Royal Dutch Shell PLC's (RDSB.LN) decision to award executives a performance bonus despite missing internal targets.

"We recommend shareholders oppose the remuneration report," at Shell's annual general meeting May 19, PIRC said in a statement. The decision of Shell's remuneration board to award the bonuses "undermines [the] consistent long-term approach to performance," PIRC said.

One of Shell's largest shareholders, Standard Life Investments, also criticized the company's remuneration decision Tuesday.

Company Web site: www.shell.com

-By James Herron, Dow Jones Newswires; +44 (0)20 7842 9317; james.herron@dowjones.com